Penguin Random House is a launch partner for a new initiative by Twitter to turn the social media platform into a shopping experience.
When you click on book related branding by Penguin Random House, such as a Tweet about a latest bestseller it will take you to a dedicated product page within Twitter. You can then check out tweets by other others talking about the book and view the description of the title. If you like what you see there is a buy button and Twitter handles the payment processing. The shipping cost of the book is factored into the cost and the pricing is very respectable.
If you visit the Penguin Random House Twitter profile, you will see a new entry below their photos called Browse Collection. There are nine books available to preview that were all added on June 18th 2015. Clicking on the image will bring up the dedicated product page for that particular title
I think product pages for e-books is certainly more initiative than past shopping experiences Twitter has experimented with. Last year the company partnered with Amazon that allowed users to use the hashtag #amazoncart and that product would automatically be added to your shopping cart.